Course Details
Subject {L-T-P / C} : MM3102 : Phase Transformation { 3-0-0 / 3}
Subject Nature : Theory
Coordinator : Prof. Bankim Chandra Ray
Syllabus
Thermodynamics and Kinetics of solid state Phase transformation, Atomic models of Diffusion, Allotropy of Iron and Fe-C Phase diagram, Functions of alloying elements, Importance of Austenite Grain size Formation of Austenite, TTT and CCT Diagrams, Homogeneous and Heterogeneous nucleations, Strain energy effects Overall Transformation Kinetics, Empirical equations, Transformation kinetics for Interface-controlled and Diffusion-controlled growth Pearlitic, Bainitic and Martensitic Transformations (Mechanisms, Kinetics and Morphologies). Pearlitic transformation, Factors influencing pearlitic transformation, Mechanism of transformation, Nucleation and growth, Orientation relationship Bainitic transformation: Mechanism of transformation, Nucleation and growth, Orientation relationships, Surface relief, Classical and non-classical morphology, Effect of alloying elements Martensitic transformation: Characteristics of transformation, Thermodynamics and kinetics, Nucleation and growth, Morphology, Crystallography, Stabilization Strengthening mechanisms, Recovery, Recrystallization and Grain growth, Annihilation of point imperfections, Mechanism of nucleation and driving force for growth Massive and Spinodal Decomposition Mechanism and Kinetics of precipitation of age-hardenable alloys.
Course Objectives
- To follow the thermodynamics and kinetics of phase transformations.
- To understand the priciple of austenitizations and implication of different parameters on its kinetics.
- To understand various mechanisms of pearlitic, Baintitic, and martensitic Transformations in the Fe-C system.
- To understand age-hardening and recrystallization processes.
Course Outcomes
1. The Course integrates the thermodynamics and mechanism of different phase transformations to follow their importance in the structure-property relationship. <br />2. The course outlines the thermodynamic background of phase transformations. <br />3. Characteristic and morphological features are well demonstrated in the course outcome. <br />4. Different types of transformations especially in steels are cited to highlight the importance of phase and properties. <br />5. Mechanism and kinetics of precipitation hardening are well enumerated to understand its importance in designing materials to perform in the targetted areas of application. <br />6. Recrystallization annealing has been covered to cite its importance during the working of steels.
Essential Reading
- D. A. Porter and K E Easterling,, Phase Transformations in Metals and Alloys, CRC Press
- V. Raghavan, Solid State Phase Transformations, PHI
Supplementary Reading
- J. W. Christian, The Theory of Transformations in Metals and Alloys, Pergamon Press.
- R. E. Reed-Hill, Physical Metallurgy Principles, East-West Press